The US Department of Energy is expected to announce Tuesday that its researchers have achieved a "major scientific breakthrough" regarding nuclear fusion, a technology seen as a possible revolutionary alternative power source.

Scientists have been working for decades to develop nuclear fusion -- touted by its supporters as a clean, abundant and safe source of energy that could eventually allow humanity to break its dependence on the fossil fuels driving a global climate crisis.

The Energy Department has refused to give any specific details about what it will announce Tuesday, but a Financial Times report over the weekend has set the scientific community abuzz.

According to the UK-based outlet, researchers at the Lawrence Livermore National Laboratory (LLNL) in California have succeeded for the first time in producing a "net energy gain" from nuclear fusion, meaning more energy was produced in the reaction than was used to activate it.

If the achievement is confirmed, "that is a true breakthrough moment which is tremendously exciting," said physicist Jeremy Chittenden with Imperial College London.

"It proves that the long sought-after goal, the 'holy grail' of fusion, can indeed be achieved."

Nuclear power plants around the world currently use fission -- the splitting of a heavy atom's nucleus -- to produce energy.

Fusion on the other hand combines two light hydrogen atoms to form one heavier helium atom, releasing a large amount of energy in the process.

That's the process that occurs inside stars, including our sun.

On Earth, fusion reactions can be provoked by heating hydrogen to extreme temperatures inside specialized devices.

Researchers at the LLNL use the massive National Ignition Facility -- 192 ultra-powerful lasers all pointed into a thimble-sized cylinder filled with hydrogen.

According to the Financial Times, LLNL scientists recently produced about 2.5 megajoules of energy in a nuclear fusion reaction, or about 120 percent of the 2.1 megajoules used by the lasers to initiate it.

- Decades to achieve -

That result would finally provide proof for the physical principles outlined decades ago by fusion researchers. It would be a "a success of the science," said Tony Roulstone, a lecturer at Cambridge University.

Like fission, fusion is carbon-free during operation, but has many more advantages: it poses no risk of nuclear disaster and produces much less radioactive waste.

However, there is still a long way to go before fusion is viable on an industrial scale.

"To turn fusion into a power source we'll need to boost the energy gain still further," cautions Chittenden.

"We'll also need to find a way to reproduce the same effect much more frequently and much more cheaply before we can realistically turn this into a power plant," he added.

That could take yet another 20 or 30 years, Erik Lefebvre, project manager at the French Atomic Energy Commission, told AFP.

Climate experts however warn that the world cannot wait that long to reduce its greenhouse gas emissions, and limit the worst effects of global warming.

Other nuclear fusion projects are also in development around the world, including the major international project known as ITER, which is currently under construction in France.

Instead of lasers, ITER will use a technique known as magnetic confinement, containing a swirling mass of fusing hydrogen plasma within a massive donut-shaped chamber.

Nuclear fusion: harnessing the power of the stars
Washington (AFP) Dec 13, 2022 - The US Department of Energy's nuclear fusion laboratory says there will be a "major scientific breakthrough" announced Tuesday, as media report that scientists have finally surpassed an important milestone for the technology: getting more energy out than was put in.

The announcement has the scientific community abuzz, as nuclear fusion is considered by some to be the energy of the future, particularly as it produces no greenhouse gases, leaves little waste and has no risk of nuclear accidents.

Here is an update on how nuclear fusion works, what projects are underway and estimates on when they could be completed:

- Energy of the stars -

Fusion differs from fission, the technique currently used in nuclear power plants, by fusing two atomic nuclei instead of splitting one.

In fact, fusion is the process that powers the sun.

Two light hydrogen atoms, when they collide at very high speeds, fuse together into one heavier element, helium, releasing energy in the process.

"Controlling the power source of the stars is the greatest technological challenge humanity has ever undertaken," tweeted physicist Arthur Turrell, author of "The Star Builders."

- Two distinct methods -

Producing fusion reactions on Earth is only possible by heating matter to extremely high temperatures -- over 100 million degrees Celsius (180 million Fahrenheit).

"So we have to find ways to isolate this extremely hot matter from anything that could cool it down. This is the problem of containment," Erik Lefebvre, project leader at the French Atomic Energy Commission (CEA), told AFP.

One method is to "confine" the fusion reaction with magnets.

In a huge donut-shaped reactor, light hydrogen isotopes (deuterium and tritium) are heated until they reach the state of plasma, a very low density gas.

Magnets confine the swirling plasma gas, preventing it from coming into contact with the chamber's walls, while the atoms collide and begin fusing.

This is the type of reactor used in the major international project known as ITER, currently under construction in France, as well as the Joint European Torus (JET) near Oxford, England.

A second method is inertial confinement fusion, in which high energy lasers are directed simultaneously into a thimble-sized cylinder containing the hydrogen.

This technique is used by the French Megajoule Laser (LMJ), and the world's most advanced fusion project, the California-based National Ignition Facility (NIF).

Inertial confinement is used to demonstrate the physical principles of fusion, while magnetic confinement seeks to mimic future industrial-scale reactors.

- State of research -

For decades, scientists have attempted to achieve what is known as "net energy gain" -- that is, more energy is produced by the fusion reaction than it takes to activate it.

According to reports by the Financial Times and the Washington Post, that will be the "major scientific breakthrough" announced Tuesday by the NIF.

But Lefebvre cautions that "the road is still very long" before "a demonstration on an industrial scale that is commercially viable."

He says such a project will take another 20 or 30 years to be completed.

To get there, researchers must first increase the efficiency of the lasers and reproduce the experiment more frequently.

- Fusion's benefits -

The NIF's reported success has sparked great excitement in the scientific community, which is hoping the technology could be a game-changer for global energy production.

Unlike fission, fusion carries no risk of nuclear accidents.

"If a few lasers are missing and they don't go off at the right time, or if the confinement of the plasma by the magnetic field... is not perfect," the reaction will simply stop, Lefebvre says.

Nuclear fusion also produces much less radioactive waste than current power plants, and above all, emits no greenhouse gases.

"It is an energy source that is totally carbon-free, generates very little waste, and is intrinsically extremely safe," according to Lefebvre, who says fusion could be "a future solution for the world's energy problems."

Regardless of Tuesday's announcement, however, the technology is still a far way off from producing energy on an industrial scale, and cannot therefore be relied on as an immediate solution to the climate crisis.

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Lehigh University shares in $47 million DOE push to accelerate fusion energy research
Bethlehem PA (SPX) Dec 08, 2022
The world's largest nuclear fusion reactor is currently being built in the south of France. Called ITER- Latin for "the path"-the machine is the product of an international effort to essentially harness the energy-generating power of the sun. "The goal of ITER is to produce 10 times more energy than is required to operate it," says Eugenio Schuster, a professor of mechanical engineering and mechanics in Lehigh University's P.C. Rossin College of Engineering and Applied Science. "Everyone in the fu ... read more